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Non-radioactive in situ Hybridization Protocol Applicable for Norway Spruce and a Range of Plant Species
Published on: April 17, 2009
Molecular evolution of cdc2 pseudogenes in spruce (Picea)
A Kvarnheden1, V A Albert, P Engström
1Department of Physiological Botany, Uppsala University, Sweden.
Plant Molecular Biology
|April 4, 1998
Summary
This study reveals high conservation of cell cycle regulator cdc2 genes across spruce and pine species. Pseudogene formation in Picea occurs rapidly, with specific mutation patterns mirroring those in mammals.
Area of Science:
- Molecular Biology
- Plant Genetics
- Evolutionary Biology
Background:
- Cyclin-dependent protein kinases (CDKs), including p34cdc2, are crucial for regulating the eukaryotic cell cycle.
- Previous work identified a functional cdc2 gene in Picea abies, alongside numerous related pseudogenes.
Purpose of the Study:
- To isolate and characterize functional and pseudogene cdc2 sequences from additional conifer species.
- To investigate the evolutionary conservation and diversification of cdc2 genes and pseudogenes in Picea and Pinus.
Main Methods:
- Isolation of partial functional and pseudogene cdc2 sequences from Picea engelmannii, Picea sitchensis, and Pinus contorta.
- Phylogenetic analyses of identified sequences, including assessment of insertions, deletions, and nucleotide substitution patterns.
- Comparison of mutation patterns in plant cdc2 pseudogenes with those observed in mammalian pseudogenes.
Main Results:
- High sequence conservation of cdc2 genes and pseudogenes was observed across the studied conifer species.
- Phylogenetic analyses supported the classification of most Picea cdc2 pseudogenes into two distinct subfamilies.
- A rapid rate of new cdc2 pseudogene formation was detected in Picea, exceeding their elimination by neutral mutations.
- Nucleotide changes in cdc2 pseudogenes exhibited a strong bias towards specific transitions (C to T, G to A) and transversions (C to A, G to T), similar to mammalian pseudogenes.
Conclusions:
- The study highlights significant evolutionary conservation of cdc2 sequences in conifers.
- Picea exhibits a high rate of cdc2 pseudogene formation, with distinct evolutionary dynamics.
- The observed mutation patterns in plant cdc2 pseudogenes suggest conserved mechanisms of pseudogene evolution across kingdoms.
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